<template>
	<view>
		<view class="scroll-view-container">
			<!-- 左侧滑动区 -->
			<scroll-view scroll-y="true" class="left-scroll-view" :style="{height:wh+'px'}">
				<block v-for="(item,i) in cateList" :key="i">
					<view :class="['left-scroll-view-item', i===active ? ' active':'']" @click="activeChanged(i)">
						{{item.cat_name}}</view>
				</block>
			</scroll-view>

			<!-- 右侧滑动区 -->
			<scroll-view scroll-y="true" class="right-scroll-view" :style="{height:wh+'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<!-- 二级分类标题 -->
					<view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
					<!-- 三级分类盒子 -->
					<view class="cate-lv3-list">
						<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
							<!-- 三级分类图片 -->
							<image :src="item3.cat_icon.replace('api-ugo-dev','api-hmugo-web')"></image>
							<!-- 三级分类文本 -->
							
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>

		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				// 当前屏幕高度
				wh: 0,
				cateList: [],
				active: 0,
				cateLevel2: [],
				// 滚动条距离上方距离
				scrollTop:0

			};
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight
			this.getCateList()
		},
		methods: {
			// 获取分类列表数据
			async getCateList() {
				const {
					data: res
				} = await uni.$http.get('/api/public/v1/categories')
				if (res.meta.status !== 200) return uni.$showMsg()
				this.cateList = res.message
				this.cateLevel2 = res.message[0].children
			},
			activeChanged(i) {
				this.active = i

				//重新为二级分类赋值
				this.cateLevel2 = this.cateList[i].children
				
				this.scrollTop= this.scrollTop ===0?1:0
			},
			// 跳转到商品列表
			gotoGoodsList(item){
				console.log("trap in")
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid='+item.cat_id
				})
			}
		}
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;
	}

	.left-scroll-view {
		width: 120px;
	}
	.right-scroll-view{
		background-color: #ffffff;
	}
	.left-scroll-view-item {
		background-color: #f7f7f7;
		text-align: center;
		line-height: 60px;
		font-size: 12px;

		&.active {
			background-color: #ffffff;
			position: relative;

			&::before {
				content: '';
				display: block;
				width: 3px;
				height: 50px;
				background-color: hotpink;
				position: absolute;
				left: 0;
				top: 50%;
				transform: translateY(-50%);
			}
		}
	}
	
	.cate-lv2-title{
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}
	
	.cate-lv3-list{
		display:flex;
		flex-wrap: wrap;
		.cate-lv3-item{
			width:33.33%;
			display: flex;
			flex-direction: column;
			justify-content: center;
			align-items: center;
			margin-bottom: 10px;
			image{
				width:60px;
				height:60px;
			}
			text{
				font-size: 12px;
			}
		}
	}
</style>